//
//  MainTabBar.swift
//  Three-SinaWeibo
//
//  Created by 李旭阳 on 15/11/11.
//  Copyright © 2015年 apple. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
    
    //MARK: 构造方法
    override init(frame: CGRect) {
        super.init(frame:frame)
        setupUI()
    }
    
    //MARK: 如果重写 init(frame:) 系统会默认为这个控件是通过代码创建    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupUI()
    }

    
    //MARK: 添加按钮
    private func setupUI(){
        addSubview(composeBtn)
    }
    
    //MARK: 懒加载创建btn
    lazy var composeBtn: UIButton = {
        let btn = UIButton()
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"),forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        return btn
    }()
    
    //MARK: 设置frame
    override func layoutSubviews() {
        super.layoutSubviews()
        
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect  = CGRect(x: 0, y: 0, width: w, height: h)
        
        var index: CGFloat = 0
        for subview in subviews{
            if subview.isKindOfClass(NSClassFromString("UITabBarButton")!){
                
                subview.frame = CGRectOffset(rect, index * w, 0)
                index += index == 1 ? 2:1
            }
        }
        
        composeBtn.frame = CGRectOffset(rect, w * 2, 0)
        bringSubviewToFront(composeBtn)
    }
}
